Centrifugal liquid-separator.



No. 798,324. PATENTED AUG. 29, 1905. J. C. CROMWELL.'

GENTRIFUGAL LIQUID SEPARATOR.

APPLICATION FILED sEPIs, 1904.

3 SHEETS-SHEET 1.

PATENTED AUG. 29, 1905.

J. C. CROMWELL. GENTRIFUGAL LIQUID SEPARATOR.

APPLICATION FILED SEPT.3, 1904.

3 SHEETS-SHEET 2.

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No. 798,324. PATENTED AUG. Z9, 1905.

J. G. CROMWELL.

GENTRIFUGAL LIQUID SEPARATOR. APPLICATION FILED sums, 1904.

3 SHEETS-SHEET 3.

JOHN C. CROMWELL, OF CLEVELAND, OHIO.

CENTRIFUGAL LIQUID-SEPARATOR.

Specification of Letters Patent.

Patented Aug. 29, 1905.

Application led September 3, 1904.-. Serial No. 223,173.

To @ZZ whom, it indy concern. v

Be it known that I, JOHN C. CRoMwELL, a

citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Centrifugal Separatore, of which the following' is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

My invention relates to centrifugal separators, and particularly to an improvement in that class of the latter which is designed to retain during the separating operation the compound liquid that is being separated completely out of contact with the constituent liquids after the latter have been separated out There are included also important improvements in other features of a separator, which will be referred to hereinafter. Said invention as a whole consists of means hereinafter fully described, and specifically set forth in the claims.

My invention is adapted to be used in the separation of heterogeneous bodies into their constituent parts, especially in the separation of compound liquids, and I shall describe said invention asparticularly utilized in the recovery of cream and skim-milk from whole or full milk, although obviously it may be used in the breaking up of other compound bodies.

It is well understood that the effect of the centrifugal force upon a body of full-milk is to divide the same into concentric layers arranged according to the specific gravities of the constituent liquids, the skim-milk comprising the outer layer, the cream the inner layer, and the full-milk, that is not yet sepa rated, a neutral or intermediate layer. These rings are very closely drawn and exactly arranged and remain so under the action of the centrifugal force. Now it is highly desirable, in order that the condition of these layers may not be disturbed and that there may not be a remix of the different liquids after they are once separated, that the cream and skim-milk as fast as they are separated may be fed directly each to its respective layer and thence drawn oftq from the separatingmachine without intersecting or crossing or interfering in any way with any liquid of a different density and that the full-milk, as yet `unseparated, may be retained in its intermediate laycr and subjected to the continued effect of the centrifugal action. Further, in ordervthat a complete separation of the cream and skim-milk may take place the full-milk must be subjected to the centrifugal action for a considerable period of time, several seconds possibly, and in order to allow for this it would require a plain separating-bowl of inconveniently large proportions unless a very small amount of milk were being treated. Such a bowl would necessarily be of very large diameter in order to place the milk under the action of an enormousY centrifugal force and also would be very deep in order to hold the milk under this force for a period of time of sufficient length to effect a complete separation. However, different interior devices or separating and division members may be placed within a small plain bowl and effect as thorough a separation of the cream and skim-milk as could be accomplished in a plain bowl of larger size. Two classes of theseinterior division members are concerned with my invention-A a device that will break up the milk into thin strata or layers, and thus allow it to be acted upon more quickly by the centrifugal force, and B a device that will baffle the milk in its course through the bowl, and thus hold it while it is traversing a given distance under the action of the centrifugal force for a longer period. Other conditions which must necessarily be present in order to effect a complete and satisfactory separation of the cream and skim-milk are that the full-milk that is flowing through the bowl must be caused totravelat the same speed as the bowl and be prevented from lagging, that a centrifugal force great enough to effect thediiferentspecific gravities quickly must be generated, and means for giving an overflow-opening, which shall be proportionate to the inlet, must be provided. All of these conditions and principles are utilized in my invention, and improved apparatus for carrying them out are provided in my separator, which will now be described in detail.

The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings, Figure l represents a central vertical section of a separating bowl and cover with my improved division member contained therein. Fig. Qrepresents a plan view of one of the cone-disks IOO IIO

comprising the division member. Fig. 3 represents a partial vertical section and a partial side'elevation of the division member. Fig. 4 represents a plan view of the disk attached to the bottom of the supply-tube. the latter member, illustrating a modified method ofv hinging the disks.

My improved separator com prises,broadly, a bowl A, a cover-B. with overiiow-openings, a supply-tube C, and an interior device or division member D.

The bowl A may be of any ordinary type suitable for the purpose and is connected by a spindle a, Fig. l, with the driving mechanism, (not shown,) which may be operated in any suitable manner to rotate the bowl at a speed great enough to quickly arrange the cream, skim-milk, and full-milk in their respective layers.

rl`he cover B comprises two parts Z2 b, part being an outer shell adapted to close and seal the bowl and the part b being an inner shell adapted to fit within the outer shell, so as to provide a passage b2 between the outer and inner shells for the separated skim-milk as it passes off from the bowl. rlhe top of the inner shell is a ground seat 3, snugly fitting thev outer shell and sealing the space between the two shells from the cream as the latter passes out of the separator through a central passage L* around the supply-tube C. The inner shell is provided with a plurality of rectangular slots 7)'5 around the bottom, two of which are shown in Fig. l opening from the inner periphery of the bowl to the space between the shells b and and allowing the skim-milk to pass from the bowl to the passage 52, and also strips b between the two shells and adapted to effect the proper up"- ward feed of the skim-milk in such passage by keeping it at the bowl speed andvpreventing it from slipping or lagging on the inner shell. .Proper discharge-orifices 67 for the skim-milk and a discharge-screw 58 for the cream are provided in the outer shell Z1 of the cover.

The supply-tube C consists of a hollow conduit screwed into the bottom of the bowl A and provided with suitable openings c at the bottom, through which the full-milk may flow into the bowl. Secured to this tube C on the outside are four wings c', Figs. l and 4, which act as carriers 1n the open space at the center of the bowl for the division member D,

as will be hereinafter fully explained. Secured to the bottom of the wings c is a conedisk 02, Figs. l and 4, which is so constructed and positioned that it is adapted when the supply-tube C is screwed into the bowl to rest on the bottom of the latter, and thus seal off la compartment under such disk. This disk c2 comprises a portion c3, which is asubstantially siXty-degree cone, which is the angle that has been found to best serve the purpose, and a portion o", which is substantially vertical and forms, in effect, a lower' lip upon the disk positioned at a marked angle to the cone proper. On the sixty-degree cone are four convolutions c5, approximately a quadrant apart, and each convolution is provided with a rectangular opening o in its top, and the metal of the convolution is cut away at each side of the opening for the full length of the opening, thus providing side outlets 07, Fig. l, when there is another disk resting upon the disk c2, as will be hereinafter eX- plained. On the inside of the disk c2 are four wings 0S, which act as carriers for the fullmilk in the disk 02 when the separator is revolving. In the horizontal surface at the top of the disk c2 are provided a number of apertures 09, Fig. 4, opening from the open space that is sealed OH under the disk to the central zone of the separator, the purpose of which will be hereinafter fully explained.

The interior device or division member D vconsists of a plurality of cone-disks d, (eight as illustrated in Fig. 3,) which are so constructed and hinged together that they rest one upon the other. They may be made of any metal, either cast or stamped. Although the members d are, properly speaking, frusta of cones, l shall refer to them hereinafter as the cone-disks or simply disks or cones Similarly to the disk 02 each disk (l consists of a sixty-degreecone 6l and a bottom lip cl2, Fig. 2. The center of each cone is open to receive the supply-tube C and the wings 0', the latter fitting snugly within such opening. Four convolutions d3, having rectangular openings di, Fig. 2, and side outlets d5, Figs.

l and 7, similar to the construction of disk c2, are provided on each disk CZ. The lower of the eight disks l is spaced from the disk c2 by the convolutions@5 upon the latter, the top and bottom 01 and on, respectively, Fig. l, of which convolution 05 rest snugly up against the under surface of the lower cone CZ.- Adjacent cones in the series of eight cones d are similarly spaced by the convolutions of the lower of any two contiguous cones. ln actual construction in the device illustrated each convolution is substantially three-sixteenths of an inch high, and the metal is cut away on each side of the convolution from the top of the same for a depth of about one-sixteenth of an inch to form the side outlets d5. The construction and relative positions of the cones provide about a one-thirty-secondth-of-an- IOO IIO

-lowermost disk Z, Fig. '3.

inch openingbetween the lips Z2 of adjacent and the lowermost one of the series is hinged to the disk c2, Fig. l. The method of hinging is as follows: Upon the disk c2 are two integral lugs c12 cl2, Figs. 4 and 5, within which upon a small pin is` pivoted a downwardlyprojecting ear Z, secured integrally to the Diametrically opposite to the ear ZG upon the disk Z are secured two lugs Z7 Z7, Fig. 2, similar to the lugs cl2 012 upon the disk c2, within which is pivoted upon a pin Z8 adownwardly-projecting ear d, secured upon 4the second disk Z. This method of hinging is followed out between each two successive disks, and it will be noted that the hinge portions are so fastened to the disks that the convolutions Z3 of -any two contiguous disks d alternate lor bear a staggered relation to each other and are not one upon the other;that is, there is an angle of forty-[ive degrees between the vertical plane passing through a convolution of any one disk and the vertical plane passing through the nearest adjacent convolution of a contiguous disk. From Figs. 'l and 7 it will be clearly seenthatthe side outlets Z5 of each disk lie substantially in the peripheral plane of the conical portion Z of the upper adjacent disk, since the lower surface of such conical portion of each disk lies flush with the top of the side outlets of the disk immediately below. It will be noted that this method of hinging enables the disks Z of the division member D to be separated and spread out, as illustrated in Fig; 6, whereby the division member may be easily and thoroughly cleaned. It will also benoted that this construction provides a division member composed of hinged parts which are located in different planes transverse to the axis of the separator, which are horizontal planes in the device illustrated, and I am not aware that a division member has been provided in oentrifugal separators heretofore used where the individual parts of the member have been lo- .cated when in use in different planes transverse to the axis of the separator, but they have been located in different planes parallel to the axis of the separator.

In the modified form of hinge illustrated in Figs. 8 and 9 diametrically opposite sides of the disks Z are provided with hooks OZ", which are connected by means of short links d10. This method of hinging enables the division .member D to be cleaned more readily, for the reason that the individual disks OZ can be drawn farther apart.

The operation of my improved separator is as follows: The bowl A is revolved at the proper speed, and milk is allowed toienter.

.the skim-milk outlets Z7.

the supply-tube C, Fig. 1, whence it escapes through the openings c into the space under the disk c2. The cream that has been sepa.- rated out of Vthe full-milk in this short time finds its way to the center of the space under the disk c2 and rises up through the openings c, Fig. 4, into the space between the disk c2 and the lirst disk Z, whence it has a straight course up through the bowl, around the tube C, to the cream-outlet bs, Fig. l. That part of the full-milk which has not been separated under the'disk c2 is held by the centrifugal force in a solid layer against the inner surface of the disk c2 and escapes therefrom through the side outlets c7, Fig. 1', which side outlets open up, as has been stated before, into the neutral zone between the disk c2 and the disk Z, so that the full-milk is thus fed directly into its proper position. The fullmilk which is held'against the inner wall of the disk c2 cannot escape therefrom through the cream-openings c9 on account of the angle of the cone c2 and the short horizontal lip 013 on the disk c2, Fig. l, between the cone portion of the disk and the openings c, so that the full-milk necessarily passes out through the side outlets c7. Some of the full-milk is separated into cream and skim-milk between the disk c2 and the lowermost disk Z, for it-will be noted that the milk as it escapes from the side outlets c7' is spread out in a thin stratum on the disk OZ, thus facilitating the separating process, and the cream under the action of the centrifugal force is held against the outer surface of the disk c2 and passes upwardly along such surface to the central space ofthe bowl around the supply-tube C, whence it passes directly to the cream-outlet 58. The skim-milk is held against the inner surface of the lowermost disk Z and passes downwardly along this surface until it reaches the lip d2, Figs. 1, 2, and 6, where it is baffled fora while and held until the weight ofthe skim-milk following forces it down along such lip and around the under surface of the same, whence it makes a sharp turnvand passes directly to This baffling of the skim-milk upon the lip Z2 extracts most of the cream that may have adhered thereto and not been separated previously, while the sharp turn to which the skim-milk is subjected at the bottom of the lip Z2 whips or cracks ofin from it the last vestige of cream which is associated with it. However, only a part of the full-milk is thus separated into cream and skim-milk between the disk c2 and the lowermost disk Z, and the remainder must be separated between the remaining disks. It will be noted, as has been explained before, that the side outlets d5, Fig. 1, of the disks Z are so positioned that they tap the neutral layer of liquid or the full-milk between the disk c2 and the lowermost disk d, so that that portion of the full-milk. which is as yet unseparated passes through such side youtlets Z" of the IOO ITO

IIS

' which the diagram is taken.

lowermost disk d and is spread out in a thin layer between the lowermost disk d and the second disk d, where the separati-on is repeated and a part of the full-milk broken up into cream and skim-milk. This operation 'takes place in each ,successive space until the eighth one is reached, by which timesall of 'the full-milk will have been separated into 'cream and skim-milk.

In fthe diagram Fig. 7, illustrating the relative flows of the cream, full-milk, and skimmilk between adjacent disks, it will be noted that the section of the topmost disk shown in said diagram is taken through one of the convolutions of said disk, and hence the section of the next disk in the same plane is taken through the latter disk intermediate of two oi' its convolutions by reason of the staggered relation of convolutions of adjacent disks. In said diagram it will be noted that the lowof the cream upon the outside surface of the disks is denoted by the full arrows. The iiow of the skim-milk is denoted Aby the dotted arrows on the inside surface of the disks, the arrows being dotted to denote that the skim-milk would be descending upon such lsurface in planes to the rear of the plane in Oi' course it will be understood that the skim-milk is descending upon such inside surface or' the disksV also in planes in front of the plane in which `the diagram is taken-that is, the skim-milk is descending upon the whole inside surface of the disks except those portions of such surface yas are immediately7 contiguous to the perforations d4. The flow of the full-milk from the space between two adjacent disks -to the next space is denoted `by the transverse arrows, and it will be noted that the full-milk is tapped by the perforations 0l, Fig. '2, of the convolutions at the lower part of the skim-milk layer or :at the top of the neutral layer -and that when the full-milk has passed through said perforations OZ4t it encounters theinner surface 4of the next disk, and consequently turns and escapes `into the next space, where it is spread out in a thi-n stratum through the side outlets d5, as denoted by the dots or plan View of the transverse :arrows .in the diagram.

The improved separator, which has been -hereinbefore described and which effects the separation of the cream and skim-milk in the manner noted, presents very material advantages in the art of centrifugal separation which will now be pointed out in detail. First, `the full-milk Anever leaves the neutral zone from the time it enters the disk vc2 until it is separated into cream and skim-milk, which iatter are immediately `conducted 'Lto their respective Zones-and not again commingled with 'any liquid fof fadiierent density. By thus retaining vthe full-milk in the neutral zone it is always introduced into a liquid of the Asame specific gravity, whereby its relative location cannot be disarranged, as it would be if it were upon the neutral layer is always allowed for by retaining the full-milk in the neutral Zone, and it is not necessary to make a correction for the effect of this force, as it would be if the full-milk were introduced into the neutral zone jat dilierent points in the division member instead of being retained in such neutral layer during the whole process of separation; also, although the construction shown provides means for retaining the full-milk continuously in the neutral layer, still it is not given a straight upward iiow through the division membenbut is caused to traverse a tortuous path due to the relative arrangement of the disks d. The full-milk is not crowded in the lower spaces between the disks d, leaving the upper spaces comparatively free and thus delaying the separating operation; but it is free to pass through theside outlets d5 up into the higher spaces, thus dividing the milk up into thin uniform strata, whereby the eiliciency and capacity of the machine is increased. vIn fact, the full-milk as yet unseparated is notonlyfree to pass up into the spaces between the higher disks, but it is forced to by said construction of disks, so that there is no possibility of a crowding of the full-milk into the lower spaces, and the full-milk thus crowded kup into the higher spaces meets no opposition from cream or skim-milk in passing upwardly, for it is constantly retained in the neutral layer, to which layer neither cream nor skim-milk have access after .they have been separated. 1t will :be noted that the practical eiiect of this construction of the division member is .to provide what is substantially but one compartment for the full-milk, but which compartment is -so subdivided and the parts so connected that the milk is divided therein into thi-n strata, and thus easily lacted upon, the amount-oli' milk in each stratum being :automatically adjusted by the amount of lmilk which -is being treated and there being an easy and natural passage for the milk from one stratum to :the next, but on account of the alternate varrangement vof the convolutions not a direct passage, which would carry the milk too fast through the division member. As fast `as thecream `and skim-milk-are separated out from the fullmilk they are conduct- -eddi-rectly to their respective layers, and there 'is then delivered into each successive space :only that part fof the full-milk which'is as yet IOO IIO

ISO

the top of the neutral layer or at the bottom of the skim-milk layer, by which construction there may be a commingling of a very little of the skim-milk with the full-milk, but absolutely no commingling of the cream and fullmilk, for the whole neutral layer is intel'- posed between the cream and the side outlets (Z5. The construction shown is also composed of few parts, and these are provided with plain surfaces which may be readily and easily cleaned.

l Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any one of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my inventionl. In a centrifugal separator, a disk provided with convolutions,each convolution having a perforation in its top portion located in the neutral zone of the separator.

2. In a centrifugal separator, a disk comprising a conical part and a second part positioned at an angle to said conical part, and the y latter being provided with convolutions, each convolutlon having a perforation 1n its top portion located in the neutral zone of the separator.

3. In a centrifugal separator, a disk com'- prising a conical part adapted to separate the liquid under treatment into its constituents, and a substantially vertical part adapted to baffle said liquid, one of said parts being provided with convolutions, each convolution having a perforation in its top portion located in the neutral Zone of the separator.

4. In a centrifugal separator, a disk cornprising a conical part adapted to separate the 'liquid under treatment into its constituents,

and a substantially vertical part adapted to baiiie said liquid, said conical part being provided with convolutions, each convolution having a perforation in its top portion located in the neutral Zone of the separator.

5. In a centrifugal separator, a division member formed of. a plurality of superimposed disks each provided with outlets located in the neutral Zone of the separator and lying in substantially the peripheral plane of an adjacent disk.

6. In a centrifugal separator, a division member formed of a plurality of superimposed disks each provided with convolutions and with outlets in said convolutions located in the neutral Zone of the separator, the outlets of each disk lying in substantially the peripheral plane of an adjacent disk.

7. In a centrifugal separator, a division member formed of a plurality of superimposed disks each provided with convolutions and with outlets in said convolutions located.

in the neutral zone of the separator, the outlets of each disk lying in substantiallg; the peripheral plane of the upper adjacent disk.

8. In a centrifugal separator, a division member formed of a plurality of superimposed disks each provided with convolutions forming spacing members between adjacent disks and with outlets in said convolutions located in the neutral Zone of the separator, the outlets of each disk lying in substantially the peripheral plane of the upper adjacent disk.

9. In a centrifugal separator, a division member formed of a plurality of superimposed disks each comprising a conical portion adapted to separate the liquid under treatvment into its constituents, and a second portion positioned at an angle to said conical portion and adaptedto baffle said liquid, the conicalportion being provided with outlets located in the neutral Zone of the separator and lying in substantially the peripheral plane of the conical portion of the upper adjacent disk. j

10. In a centrifugal separator,a division member formed of a plurality of disks spaced apart and each comprising a conical portion and a second portion substantially vertical, adjacent disks being adapted to overlap along their vertical portions, whereby separatingspaces are formed between the conical portions of adjacent disks and contracted liquidpassages between the vertical portions thereof.

Il. In a centrifugal separator, a division member formed of a plurality of overlapping disks each comprising a conical portion and a second portion positioned at an angle to said Ioo conical portion and constructed to baffle one ofthe separated liquids, the conical portion of each disk being' provided with a plurality of convolutions and with perforations in said convolutions located in the neutral Zone of the separator.

12. In a centrifugal separator, a division member formed of a vplurality of overlapping disks each provided with convolutions and with perforations in said convolutions, the 11o convolutions of adjacent disks being arranged in a staggered relation to each other.

i3. In a centrifugal separator, a division member formed of a plurality of overlapping disks each provided with convolutions and 14:. In a centrifugal separator, adivision 120 member formed of a plurality of overlapping disks each provided with convolutions forming spacing members between adjacent disks and with perforations in said convolutions,

the convolutions of adjacent disks being arranged in a staggered relation to each other. l5. In a centrifugal separator, a plurality of overlapping disks arranged in different planes transverse to the axis of the separator and hinged together to form a division member.

16. In a centrifugal separator, a plurality of overlapping disks arranged in diii'erent planes transverse to the axis of the separator, hinged together to form a division member, and provided with convolutions and with perforations in said convolutions located in the neutral Zone of the separator.

17. In a centrifugal separator, a division member formed of a plurality of disks each provided with convolutions and with perforations in said convolutions, the metal of said convolutions laterally of said perforations being cut away to form side outlets through said convolutions from a space between two contiguous disks to the next adjacent space.

, 18. In a centrifugal separator, a division member formed of a plurality of disks each comprising a conical portion and a second portion positioned at an angle to said conical portion, said disks adapted to overlap at a point upon said angular portion, each disk provided with convolutions and with perforations in said convolutions located in the neutral zone of the separator, the metal of said convolutions laterally of said perforations being cut away to form side outlets through said convolutions from a space between two contiguous disks to the next adjacent space.

19. In a centrifugal separator, a division member formed of a plurality of disks each comprising a conical portion and a lower lip positioned at any angle to said conical portion and adapted to baffle the separated skim-milk, said disks adapted to overlap at a point upon said angular portion, the conical portion of each disk beingI provided with a plurality of convolutions forming spacing' members between adjacent disks, perforations in said convolutions, the metal of said convolutions laterally of said perforations being cut away to form side outlets through said convolutions from a space between two contiguous disks to the next adjacent space.

20. In a centrifugal separator. a division member formed of a plurality of overlapping disks arranged in different planes transverse to the axis of the separator, each disk being hinged at opposite points to the next adjacent disks, respectively, upon both sides.

21. In a centrifugal separator, a division member formed of a plurality of overlapping disks each provided with convolutions and with perforations in said convolutions located in the neutral zone of the separator, each disk being hinged at opposite points to the next adjacent disks, respectively, upon both sides.

22. In a centrifugal separator, a division member lformed of a plurality of disks each comprising a conical portion and a lower lip positioned at an angle to said conical portion and adapted to baffle the separated skim-milk, each disk provided with con volutions and with perforations in said convolutions, and being hinged at diametricall y opposite points to the tion, said disks adapted to overlap at a point on said angular portion, the conical portion of each disk being provided with a plurality of convolutions forming spacing members between adjacent disks, perforations in said convolutions, the metal of said convolutions laterally of said perforations being cut away to form side outlets through said convolutions from a space between two contiguous disks to the next adjacent space, each disk being hinged at diametrically opposite points to the next adjacent disks, respectively, upon both sides. I

24. In a centrifugal separator, the combination with a sup ply-tube provided with suitable openings for the escape of the full-milk and with a conical disk upon its lower portion, of a plurality of overlapping disks adapted to fit over such conical disk, each provided with convolutions and with pei-fora` tions in such convolutions in the neutral zone of the separator, the convolutions of adjacent disks being staggered relatively to each other, said conical disk being provided with suitable discharge-openings for cream in the central Zone, and with suitable discharge-openings for full-milk in the neutral Zone.

25. In a centrifugal separator, the combination with a supply-tube provided with suitable openings for the escape of the full-milk and with a conical disk upon its lower portion having a substantially vertical lip, of a plurality of superimposed disks adapted to fit over such conical disk and each comprising a conical portion adapted to separate the liquid Linder treatment into its constituents, and a substantially vertical portion adapted to bafiie said liquid, each of said superimposed disks provided with convolutions in its conical portion and with perforations in such convolutions in the neutral zone of the separator, said first-mentioned conical disk being provided with suitable discharge -openings for cream in the central Zone, and with suitable discharge-openings for full-milk in the neutral zone.

26. In a centrifugal separator, the combination with a supply-tube provided with suitable openings for the escape of the full-milk and with a conical disk upon its lower portion adapted to seal off upon the bottom of the separator a compartmentinto which such fullmilk escapes, said disk being provided with a horizontal lip having discharge-openings for IDO IIO

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the cream into the central zone of the separaand with perforations in said convolutions lotor, and also provided with couvolutions havcated in said neutral zone of the separator. ing perforations located in the neutral zone Signed by me this 30th day of August, 1904. IO

of the separator, of a plurality of overlap- JOHN C. CROMWELL. 5 ping disks adapted to-t over such conical disk, Attest:

' constructed to receive the full-milk from the D. T. DAVIES,

latter, and each provided With convolutions l G. W. SAYWELL. 

